Modelling the effective rainfall on maize

Detalhes bibliográficos
Autor(a) principal: Silva, Cícero Lopes A.
Data de Publicação: 1994
Outros Autores: Ramos, Márcio Mota, Ferreira, Paulo Afonso, Sediyama, Gilberto Chohaku, Loureiro, Blanor Torres
Tipo de documento: Artigo
Idioma: por
Título da fonte: Pesquisa Agropecuária Brasileira (Online)
Texto Completo: https://seer.sct.embrapa.br/index.php/pab/article/view/4135
Resumo: A model was developed to simulate the effective rainfall for supplementary irrigation purposes. The model was based on physical-hydric properties of the soil, on rainfall characteristics, on evapotranspiration of the crop, and on leaf interceptation losses. The Darcy equation was used to calculate the re-distribution of water in the soil and the percolation losses. The unsaturated hydraulic conductivity of the soil was calculated by the Campbell equation. A potential equation was adjusted to simulate the interception losses, from measured data of interception losses of 21 rainfalls events, measured in the period between December 7, 1991, and January 22, 1992, in Viçosa, MG, Brazil. Total rainfall during the crop cycle (115 days) was 941.2 mm and the simulated losses due to interception were 243.2 mm, corresponding to 26% of the total rainfall. It was concluded that 75% of the differences between the measured and the simulated moisture were lower than 10%, wich indicates that the model could be used to calculate the effective rainfall for irrigation planning of intervals equal to or greater than 30 days.
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spelling Modelling the effective rainfall on maizeModelagem da precipitacão efetiva na cultura do milhomeasured moisture; simulated moisture; supplementary irrigation; Zea maysirrigação suplementar; umidade medida; umidade simulada; Zea maysA model was developed to simulate the effective rainfall for supplementary irrigation purposes. The model was based on physical-hydric properties of the soil, on rainfall characteristics, on evapotranspiration of the crop, and on leaf interceptation losses. The Darcy equation was used to calculate the re-distribution of water in the soil and the percolation losses. The unsaturated hydraulic conductivity of the soil was calculated by the Campbell equation. A potential equation was adjusted to simulate the interception losses, from measured data of interception losses of 21 rainfalls events, measured in the period between December 7, 1991, and January 22, 1992, in Viçosa, MG, Brazil. Total rainfall during the crop cycle (115 days) was 941.2 mm and the simulated losses due to interception were 243.2 mm, corresponding to 26% of the total rainfall. It was concluded that 75% of the differences between the measured and the simulated moisture were lower than 10%, wich indicates that the model could be used to calculate the effective rainfall for irrigation planning of intervals equal to or greater than 30 days.Com o objetivo de simular a precipitação efetiva para fins de irrigação suplementar, desenvolveu-se um modelo embasado nas propriedades físico-hídricas do solo, nas características de cada chuva, nas condições de evapotranspiração da cultura e nas perdas por interceptação foliar. Para calcular a redistribuição de água no solo e as perdas por percolação, usou-se a equação de Darcy. Para calcular a condutividade hidráulica não saturada do solo, usou-se a equação de Cambell. Para simular a interceptação foliar, ajustou-se uma equação potencial, a partir dos dados medidos de interceptação foliar de 21 chuvas, tomadas no período de 7 de dezembro de 1991 a 22 de janeiro de 1992, na cidade de Viçosa, MG. Em todo o ciclo da cultura (115 dias), o total precipitado foi de 941,2 mm, e a interceptação foliar simulada foi de 243,2 mm, correspondendo a 26% do total. Verificou-se que 75% dos desvios entre a umidade medida e a simulada foram menores que 10%, o que leva a crer que o modelo possa ser utilizado para calcular a precipitação efetiva, em intervalos de tempo maiores ou iguais a 30 dias, para o planejamento de projetos de irrigação.Pesquisa Agropecuaria BrasileiraPesquisa Agropecuária BrasileiraSilva, Cícero Lopes A.Ramos, Márcio MotaFerreira, Paulo AfonsoSediyama, Gilberto ChohakuLoureiro, Blanor Torres1994-06-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://seer.sct.embrapa.br/index.php/pab/article/view/4135Pesquisa Agropecuaria Brasileira; v.29, n.6, jun. 1994; 929-937Pesquisa Agropecuária Brasileira; v.29, n.6, jun. 1994; 929-9371678-39210100-104xreponame:Pesquisa Agropecuária Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAporhttps://seer.sct.embrapa.br/index.php/pab/article/view/4135/1426info:eu-repo/semantics/openAccess2012-02-13T20:45:05Zoai:ojs.seer.sct.embrapa.br:article/4135Revistahttp://seer.sct.embrapa.br/index.php/pabPRIhttps://old.scielo.br/oai/scielo-oai.phppab@sct.embrapa.br || sct.pab@embrapa.br1678-39210100-204Xopendoar:2012-02-13T20:45:05Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false
dc.title.none.fl_str_mv Modelling the effective rainfall on maize
Modelagem da precipitacão efetiva na cultura do milho
title Modelling the effective rainfall on maize
spellingShingle Modelling the effective rainfall on maize
Silva, Cícero Lopes A.
measured moisture; simulated moisture; supplementary irrigation; Zea mays
irrigação suplementar; umidade medida; umidade simulada; Zea mays
title_short Modelling the effective rainfall on maize
title_full Modelling the effective rainfall on maize
title_fullStr Modelling the effective rainfall on maize
title_full_unstemmed Modelling the effective rainfall on maize
title_sort Modelling the effective rainfall on maize
author Silva, Cícero Lopes A.
author_facet Silva, Cícero Lopes A.
Ramos, Márcio Mota
Ferreira, Paulo Afonso
Sediyama, Gilberto Chohaku
Loureiro, Blanor Torres
author_role author
author2 Ramos, Márcio Mota
Ferreira, Paulo Afonso
Sediyama, Gilberto Chohaku
Loureiro, Blanor Torres
author2_role author
author
author
author
dc.contributor.none.fl_str_mv

dc.contributor.author.fl_str_mv Silva, Cícero Lopes A.
Ramos, Márcio Mota
Ferreira, Paulo Afonso
Sediyama, Gilberto Chohaku
Loureiro, Blanor Torres
dc.subject.por.fl_str_mv measured moisture; simulated moisture; supplementary irrigation; Zea mays
irrigação suplementar; umidade medida; umidade simulada; Zea mays
topic measured moisture; simulated moisture; supplementary irrigation; Zea mays
irrigação suplementar; umidade medida; umidade simulada; Zea mays
description A model was developed to simulate the effective rainfall for supplementary irrigation purposes. The model was based on physical-hydric properties of the soil, on rainfall characteristics, on evapotranspiration of the crop, and on leaf interceptation losses. The Darcy equation was used to calculate the re-distribution of water in the soil and the percolation losses. The unsaturated hydraulic conductivity of the soil was calculated by the Campbell equation. A potential equation was adjusted to simulate the interception losses, from measured data of interception losses of 21 rainfalls events, measured in the period between December 7, 1991, and January 22, 1992, in Viçosa, MG, Brazil. Total rainfall during the crop cycle (115 days) was 941.2 mm and the simulated losses due to interception were 243.2 mm, corresponding to 26% of the total rainfall. It was concluded that 75% of the differences between the measured and the simulated moisture were lower than 10%, wich indicates that the model could be used to calculate the effective rainfall for irrigation planning of intervals equal to or greater than 30 days.
publishDate 1994
dc.date.none.fl_str_mv 1994-06-01
dc.type.none.fl_str_mv
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://seer.sct.embrapa.br/index.php/pab/article/view/4135
url https://seer.sct.embrapa.br/index.php/pab/article/view/4135
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv https://seer.sct.embrapa.br/index.php/pab/article/view/4135/1426
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Pesquisa Agropecuaria Brasileira
Pesquisa Agropecuária Brasileira
publisher.none.fl_str_mv Pesquisa Agropecuaria Brasileira
Pesquisa Agropecuária Brasileira
dc.source.none.fl_str_mv Pesquisa Agropecuaria Brasileira; v.29, n.6, jun. 1994; 929-937
Pesquisa Agropecuária Brasileira; v.29, n.6, jun. 1994; 929-937
1678-3921
0100-104x
reponame:Pesquisa Agropecuária Brasileira (Online)
instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron:EMBRAPA
instname_str Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron_str EMBRAPA
institution EMBRAPA
reponame_str Pesquisa Agropecuária Brasileira (Online)
collection Pesquisa Agropecuária Brasileira (Online)
repository.name.fl_str_mv Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
repository.mail.fl_str_mv pab@sct.embrapa.br || sct.pab@embrapa.br
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